ORGANIZATION, BUSINESS AND BASIS OF PRESENTATION (Policies)	9 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The financial statements of the Company include the accounts of Barings BDC, Inc. and its wholly-owned subsidiaries. The effects of all intercompany transactions between the Company and its wholly-owned subsidiaries have been eliminated in consolidation. The Company is an investment company and, therefore, applies the specialized accounting and reporting guidance in Accounting Standards Codification (“ASC”) Topic 946, Financial Services – Investment Companies (“ASC Topic 946”). ASC Topic 946 states that consolidation by the Company of an investee that is not an investment company is not appropriate, except when the Company holds a controlling interest in an operating company that provides all or substantially all of its services directly to the Company or to its portfolio companies. None of the portfolio investments made by the Company qualify for this exception. Therefore, the Company’s investment portfolio is carried on the Unaudited and Audited Consolidated Balance Sheets at fair value, as discussed further in “Note 3. Investments”, with any adjustments to fair value recognized as “Net unrealized appreciation (depreciation)” on the Unaudited Consolidated Statements of Operations. The accompanying Unaudited Consolidated Financial Statements are presented in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Articles 6, 10 and 12 of Regulation S-X. Accordingly, certain disclosures accompanying annual consolidated financial statements prepared in accordance with U.S. GAAP are omitted. In the opinion of management, all adjustments, consisting solely of normal recurring adjustments necessary for the fair presentation of financial statements for the interim period, have been reflected in the Unaudited Consolidated Financial Statements. The current period’s results of operations are not necessarily indicative of results that ultimately may be achieved for the full fiscal year. Additionally, the Unaudited Consolidated Financial Statements and accompanying notes should be read in conjunction with the Audited Consolidated Financial Statements and notes thereto for the year ended December 31, 2023. Financial statements prepared on a U.S. GAAP basis require management to make estimates and assumptions that affect the amounts and disclosures reported in the Unaudited Consolidated Financial Statements and accompanying notes. Such estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed herein.
Recently Issued Accounting Standards	Recently Issued Accounting Standards In June 2022, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update, 2022-03, Fair Value Measurement (Topic 820) (“ASU 2022-03”), which affects all entities that have investments in equity securities measured at fair value that are subject to a contractual sale restriction. The amendments in ASU 2022-03 clarify that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and, therefore, is not considered in measuring the fair value. The amendments also require additional disclosures for equity securities subject to contractual sale restrictions that are measured at fair value in accordance with Topic 820. The effective dates for the amendments in ASU 2022-03 are for fiscal years beginning after December 15, 2023 and interim periods within those fiscal years. The Company determined this guidance will not have a material impact on its consolidated financial statements. In November 2023, the FASB issued Accounting Standards Update, 2023-07, Segment Reporting (Topic 280) (“ASU 2023-07”), which applies to all entities that are required to report segment information in accordance with Topic 280, Segment Reporting. The amendments in ASU 2023-07 improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. The effective dates for the amendments in ASU 2023-07 are for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements.
Share Purchase Programs	Share Purchase Programs On February 23, 2023, the Board authorized a 12-month share repurchase program (the “Prior Share Repurchase Program”). Under the Prior Share Repurchase Program, the Company was able to repurchase, during the 12-month period commencing on March 1, 2023, up to $30.0 million in the aggregate of its outstanding common stock in the open market at prices below the then-current net asset value (“NAV”) per share. The timing, manner, price and amount of any share repurchases was determined by the Company, in its discretion, based upon the evaluation of economic and market conditions, the Company’s stock price, applicable legal, contractual and regulatory requirements and other factors. The Prior Share Repurchase Program terminated on March 1, 2024. The Prior Share Repurchase Program did not require the Company to repurchase any specific number of shares, and the Company could not assure stockholders that any shares would have been repurchased under the program. During both the three and nine months ended September 30, 2024, the Company did not repurchase any shares pursuant to the Prior Share Repurchase Program. During the year ended December 31, 2023, the Company repurchased a total of 1,849,096 shares of common stock in the open market under the Prior Share Repurchase Program at an average price of $7.99 per share, including brokerage commissions. On February 22, 2024, the Board authorized a new 12-month share repurchase program (the “Share Repurchase Program”). Under the Share Repurchase Program, the Company may repurchase, during the 12-month period commencing on March 1, 2024, up to $30.0 million in the aggregate of its outstanding common stock in the open market at prices below the then-current NAV per share. The timing, manner, price and amount of any share repurchases will be determined by the Company, in its discretion, based upon the evaluation of economic and market conditions, the Company’s stock price, applicable legal, contractual and regulatory requirements and other factors. The Share Repurchase Program is expected to be in effect until March 1, 2025, unless extended or until the aggregate repurchase amount that has been approved by the Board has been expended. The Share Repurchase Program does not require the Company to repurchase any specific number of shares, and the Company cannot assure stockholders that any shares will be repurchased under the Share Repurchase Program. The Share Repurchase Program may be suspended, extended, modified or discontinued at any time. During the three months ended September 30, 2024, the Company repurchased a total of 199,054 shares of its common stock in the open market under the Share Repurchase Program at an average price of $9.84 per share, including brokerage commissions. During the nine months ended September 30, 2024, the Company repurchased a total of 508,132 shares of its common stock in the open market under the Share Repurchase Program at an average price of $9.79 per share, including brokerage commissions.